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CONTINGENCIES (Details)
$ in Thousands
3 Months Ended
Mar. 22, 2017
Mar. 31, 2017
USD ($)
Lawsuit
Plaintiff
Mar. 22, 2014
TankBarge
Guarantor Obligations [Line Items]      
Issued guaranties   $ 13,593  
Maximum [Member]      
Guarantor Obligations [Line Items]      
Guarantor obligations, expiration period   3 years  
Performance Bonds [Member]      
Guarantor Obligations [Line Items]      
Issued guaranties   $ 9,559  
Collision with M/S Summer Wind [Member]      
Loss Contingencies [Line Items]      
Number of tank barges | TankBarge     2
Number of vessels damaged in collision resulting in fuel oil discharge | TankBarge     1
Number of actions filed against the Company | Lawsuit   2  
Claims expiration period under OPA 3 years    
Number of crewmembers alleging damages | Plaintiff   2  
Letters Of Credit [Member]      
Guarantor Obligations [Line Items]      
Issued guaranties   $ 4,034